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74 lines
1.6 KiB
Plaintext
74 lines
1.6 KiB
Plaintext
/*
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* Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#include <Atom/Features/SrgSemantics.azsli>
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ShaderResourceGroup InstanceSrg : SRG_PerDraw
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{
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float2 m_viewportSize;
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Texture2D m_texture;
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Sampler m_sampler
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{
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MaxAnisotropy = 16;
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AddressU = Clamp;
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AddressV = Clamp;
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AddressW = Clamp;
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};
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};
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struct VSInput
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{
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float3 m_position : POSITION;
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float4 m_color : COLOR0;
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float2 m_uv : TEXCOORD0;
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};
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struct VSOutput
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{
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float4 m_position : SV_Position;
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float4 m_color : COLOR0;
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float2 m_uv : TEXCOORD0;
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};
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VSOutput MainVS(VSInput IN)
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{
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// Convert from screen space to clip space
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float2 posXY = float2(IN.m_position.xy) / InstanceSrg::m_viewportSize * 2.0f - float2(1.0f, 1.0f);
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posXY.y *= -1.0f;
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float4 posPS = float4(posXY, IN.m_position.z, 1.0f);
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VSOutput OUT;
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OUT.m_position = posPS;
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OUT.m_color = IN.m_color;
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OUT.m_uv = IN.m_uv;
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return OUT;
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};
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struct PSOutput
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{
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float4 m_color : SV_Target0;
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};
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PSOutput MainPS(VSOutput IN)
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{
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PSOutput OUT;
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float4 tex;
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tex = InstanceSrg::m_texture.Sample(InstanceSrg::m_sampler, IN.m_uv);
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float opacity = IN.m_color.a * tex.a;
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// We use pre-multiplied alpha here since it is more flexible. For example, it enables alpha-blended rendering to
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// a render target and then alpha blending that render target into another render target
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OUT.m_color.rgb = IN.m_color.rgb * tex.rgb * opacity;
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OUT.m_color.a = opacity;
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return OUT;
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};
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